What was found
FLT#842, DUB-JFK. (ETOPS) 'FUEL ACT XFER FAULT ECAM AFTER TAXIING INTO RAMP AREA ( CAUTION ON ECAM 5) ACT XFR FAULT (ACT) ); REMOVED AND REPLACED AFMC(AUXILIARY FUEL MANAGEMENT COMP, NO FAULT PRESENT, THIS CLEARS MDDR, MX-4 UPDATED R/R REF AMM 28-51-35-400.